"This is what $29 gets you at the grocery store -- and this is what families who rely on SNAP (formerly known as food stamps) have to live on for a week," the actress wrote in the photo caption. "We're going to walk in their shoes and see how far we get."

Gwyneth Paltrow plans to live off of a food stamps budget for one week as part of the #FoodBankNYCChallenge. Here is a photo the actress uploaded on Facebook of her food budget for the week. Photo Credit: Facebook

SNAP --also known as the Supplemental Nutrition Assistance Program-- offers nutrition assistance to millions of low-income families across the country.

The challenge comes as part of the #FoodBankNYCChallenge that's being promoted by famous chef Mario Batali.